Variable cut-off.



No. 694,057. Pate'ted Feb. 25, |902. A. D. 8. J. H. GILLETT.

VARIABLE CUT-UFF.

(Application led Lug. 19, 1901.) y

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UNITED STATES PATENT OEEICE.

ASA D. GILLETT, OF LAKE CITY, MINNESOTA, AND JAMES H. GILLETT, OF

EVERETT, WASHINGTON.

VARlABLECUT-fOFF.

SPECIFICATION formngpart of Letters Patent No. 694,057, dated February 25, 1902. Application filed August 19, 1901. Serial No. 72,492. (No model.)

To all whom it may concern.-

Beit known that we, ASAD. GILLETT, residing at Lake City, in the county of Wabasha and State of Minnesota, and JAMES II. GIL- 5 LETT, residing at Everett, in the county of Snohomish and State of Washington, citizens of the United States, have invented certain new and useful Improvements in Variable Out-Offs, of which the following is a specifi- .o cation.

Our invention relates to improvements in variable cut-offs for steam-engines for stern and side wheels for steamboats, and consists of the novel features of construction 1 5 and arrangement hereinafter particularly described and claimed.

In the accompanying drawings, forming part of this specification, Figure 1 is a side elevation of the main cylinder and our imzo provements arranged in connection therewith, certain parts being broken away to better show the construction; and Fig. 2 is a top plan thereof.

In the drawings, A represents the piston- 2 5 valve controlling the opening 2, leading into the end of the main cylinder 3. The piston A is connected by a rod 4 to a similar piston in the chest 5, the end of the rod 4 being connected with the usual operating mechanism.

3o The operating mechanism connected with the rod fi, which includes the mechanism for reversin g the engine, being part of the ordinary construction of the steam-engine of a stern or side Wheel steamboat and forming no part of 3 5 this invention, is not shown.

Arranged in the valve-chest 6, above the piston-valve A, is the cut-off valve B, said cutoffv valve controlling the inlet-opening 7. To each of the valves B is connected a'rod 8,

4o which projects into the opening in the adjacent end of the guide-bar C. Fulcrumed upon the guide-bar O is the cross-bar 9, to the opposite ends of which are pivotally connected the rods 10, the opposite ends of said rds be- 45 ing connected by clamps 11 with the pistonrods 8. To the cross-bar 9 is connected the lever 12, which in turn isrconnected to a rod 13, by means of which the cross-bar 9 is turned upon its support. It will be evident that as the cross-bar 9 is turned through the medium 5o of the lever 12 and rod 13 the valves B will be drawn toward each other or separated, as the case may be, to 'change the point of cut-off.

It will be understood that the guide-bar C travels uniformly, being actuated by an ec- 55 centric. (Not showmLThe valves B are actuated ldy the guide-bar Cthrough the medium of the cross-bar 9, the rods 10, and clamps 11.

We claimy Y 1. In combination with main-valve steam- 6o chests of the class described, of cut-off valvechests arranged alongside said main-valve steam-chests, and having a direct port connection therewith, valves arranged in said cut-olf valve-chests, rods connected with said 65 valves, a cross-bar pivotally supported between the ends of said rods, and a connection between the opposite ends of said cross-bar and said rods.

' 2. .In combination with a pair of main-valve 7o steam-chests,^arranged in longitudinal alinement, of a pair of cut-0E valve-chests arranged alongside said main-valve chests and having direct communication therewith, valves arranged in said cut-0E valve-chests, rods con- 75 nected with said'valves, and mechanism interposed between said rods for varying the relative positions of said cut-off valves, thereby changing the point of cut-off.

In testimony whereof We affix our signa- 8o tures in presence of two witnesses.

ASA D. GILLETT. JAMES II. GILLETT. l Witnesses as to signatureof Asa D. Gillett:

J. W. MUEDooH, J. S. l-IowAED. Witnesses as to signature of J ames II. Gillett:

CEAS. K. GREENE, WM. R. STOOKBEIDGE. 

